Internal profiles as a function of the radius and the Lagrangian mass coordinate inside 9 M_⊙ models halfway through the MS (X_c = 0.35) for different initial rotations: υ_ini/υ_crit = 0.2 (orange), 0.4 (red) (Murphy et al. 2021a), and 0.7 (green). The grey-shaded zone is the convective core of the moderately rotating model. Left panel: radial component of the meridional circulation velocity, U_r. Middle panel: angular velocity, Ω. Right panel: the solid curve shows the diffusion coefficient due to shear turbulence, D_shear. The dotted curve shows the effective diffusion coefficient, D_eff (y-axis in logarithmic scale and in units of cm² s⁻¹). For clarity, only the curve for D_eff corresponding to υ_ini = 0.7 υ_crit is shown. In the rest of the radiative zone, D_eff is in general much smaller than D_shear.